The most common malware technique for avoiding detection is to create loads of “fresh” variants. Actually, the component that changes so frequently is the packer – the outer layer of the malware, used by malware authors to encrypt the malware and make it harder to detect – whilst the functionality of the malicious code inside

…behaviour like this has been observed in other versions of Zeus. The really interesting discovery in this case is associated with the way in which these samples search for logical devices attached to an infected computer….

Kim Zetter’s article for Wired tells us that “SCADA System’s Hard-Coded Password Circulated Online for Years” – see the article at http://www.wired.com/threatlevel/2010/07/siemens-scada/#ixzz0uFbTTpM0 for a classic description of how a password can have little or no value as a security measure. Zetter quotes Lenny Zeltser of SANS as saying that ““…anti-virus tools’ ability to detect generic versions of